Magnesium alloy



Patented Apr. 30, 1940 I v UNITED STATES PATENT OFFICE No Drawing.Application May 31, 1939, Serial No. 276,716. In Switzerland September16,

3 Claims. (0!. 75-168) The invention relates to the production of In allcases, the alloys are produced in" the magnesium alloys. following way.First of all an alloy as prescribed The magnesium alloys hitherto knownfor castin co-pending application Serial No. 243,657 is ing in sand andmetal moulds do not exhibit produced with the requisite quantities ofaluminii suflicient tensile strength even if they are subum, zine,manganese, nickel and steel, and the 6 jected to improvement, viz. quickcooling folappropriate amount of magnesium as specified lowed byre-heating, and they also exhibit dein the said application. Pigs ofthis pre-alloy are fects in respect of adequate ductility so that theplaced in the furnace and are coveerd with a possibility of using themis still very limited. covering salt of known composition which com- Theobject of the present invention is to proprises magnesium chloride. Whenthe material 10 vide an improved magnesium alloy in which these hasliquefied, pig magnesium is added to the defects do not appear.requisite amount and a fresh covering of salt According to the presentinvention this object is applied. After a temperature of about 950 C. isattained by an alloy of magnesium with from has been reached heating isdiscontinued and the v 3 to 12% of the pro-alloy or master-batch alloyliquid metal which is somewhat superheated is according to co-pendingapplication Serial No. thoroughly stirred and is covered again. After 2457. which pre-alloy con is s f 1 Per cent the temperature has dropped toabout 800 C. the

Aluminium 435.41 slag is removed and the alloy is cast in moulds z 2 .39of the desired dimensions at about 700 C. 4 Manganese 1.5- 3 I claim:Nickel 8 6 1. an article of new manufacture, a mag- Steel 5 2 nesium"alloy having a composition falling within Magnesium 21' --18 the range:v

i The alloy according to the invention thus has Per cent a compositionfalling within the following Aluminium 1.23 5.22 limits: cent Zinc 0.783.6 Aluminium 1.23 5.22 af '7 Zinc 0.7a as M0 Manganese 0.045- 036 S eelNickel 0.09 0.72 Magneslum Steel 0.06 0.60 i

Magnesium 90.16 -97.63 5 f f gff of new manufacture an alloy Forproducing an alloy within the foregoing l P t range which after beingcast in sand moulds er a exhibits high tensile strength and highductility, g 3 the comp sition may be as follows. Per cent 5;; 0'1Aluminium 4 Nickel 02 fi 8 Steel 0.2

anganese- M mum Nickel v 0.2 agn steel 3. As an article of newmanufacture, an alloy Magnesium consisting of: ,n

An alloy which has high ductility in association Per cent with moderatetensile strength has the following Aluminium 2. commsltion: Percent zine3.5 Aluminium i 2 Manganese 03 Zinc 3.5 -Nickel 0.5 1 Manganese 0.3Steel 0.1 Nickel 0.5 Magnesium 93.6 Steel 0.1

Magnesium -1 93.6 r FRITZ CHRIS'I'EN.

